java实现MD5加盐算法

import java.security.MessageDigest;import java.util.Random;import org.apache.commons.codec.binary.Hex;public class PasswordUtil {/** * 生成含有随机盐的密码 */public static String generate(String password) {Random r = new Random(); StringBuilder sb = new StringBuilder(16); sb.append(r.nextInt(99999999)).append(r.nextInt(99999999)); int len = sb.length(); if (len < 16) { for (int i = 0; i < 16 - len; i++) { sb.append("0"); } } String salt = sb.toString(); password = md5Hex(password + salt); char[] cs = new char[48]; for (int i = 0; i < 48; i += 3) { cs[i] = password.charAt(i / 3 * 2); char c = salt.charAt(i / 3); cs[i + 1] = c; cs[i + 2] = password.charAt(i / 3 * 2 + 1); }return new String(cs);}/** * 校验密码是否正确 */public static boolean verify(String password, String md5) { char[] cs1 = new char[32];char[] cs2 = new char[16];for (int i = 0; i < 48; i += 3) {cs1[i / 3 * 2] = md5.charAt(i);cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);cs2[i / 3] = md5.charAt(i + 1);}String salt = new String(cs2);return md5Hex(password + salt).equals(new String(cs1));}/** * 获取十六进制字符串形式的MD5摘要 */public static String md5Hex(String src) {try {MessageDigest md5 = MessageDigest.getInstance("MD5");byte[] bs = md5.digest(src.getBytes());return new String(new Hex().encode(bs));} catch (Exception e) {return null;}}public static void main(String[] args) {String password = generate("admin");System.out.println(verify("admin", password));}}